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Magnetic nanoparticles and quantum dots co-loaded imprinted matrix for pentachlorophenol.

Journal of hazardous materials (2012-09-12)
Min Yang, Aijuan Han, Junling Duan, Zhipeng Li, Yongchao Lai, Jinhua Zhan
ABSTRACT

In this study, an imprinted silica matrix of pentachlorophenol (PCP) co-loaded with Fe(3)O(4) nanoparticles and ZnS:Mn(2+) quantum dots (QDs) was fabricated. The introduction of Fe(3)O(4) nanoparticles to the imprinted matrix provided an easy way to separate PCP under an external magnetic field. ZnS:Mn(2+) QDs offered a readout signal to monitor the amount of PCP bound to the imprinted matrix and evaluate the efficiency of imprinting. X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy were used to characterize the imprinted matrix. The low angle X-ray diffraction and N(2) adsorption-desorption analysis indicated a periodic mesoporous structure. The as-synthesized imprinted matrix preferred to adsorb PCP rather than the other aromatic compounds like 2,4-dichlorophenoxy acetic acid, 2,4-dichlorophenol and phenol. The recoveries of spiked PCP in spring water and tap water with Fe(3)O(4)-ZnS:Mn(2+) co-loaded MIPs are 101% and 97%, respectively.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Pentachlorophenol, 97%
Supelco
Pentachlorophenol, analytical standard
Supelco
Pentachlorophenol solution, certified reference material, 500 μg/mL in methanol
Supelco
Pentachlorophenol solution, certified reference material, 5000 μg/mL in methanol